Studies of rare earth - transition-metal permanent-magnet materials

Thesis/Dissertation · Tue Dec 31 23:00:00 EST 1985

OSTI ID:5312914

Oswald, E S

Studies of the anomaly in the magnetization of PrCo/sub 5/ near 100K show the cause to be a switch from conical to axial anisotropy with rising temperature. Effects on magnetic properties rendered by partial replacement of Pr in PrCo/sub 5/ by La, Ce, and Nd were investigated. While Ce and La substitutions enhance the anisotropy, they diminish the magnetic moment and the T/sup c/. Nd substitution caused an elevation in T/sup c/ and M/sup s/ but diminished the anisotropy. Effects of the introduction of small amounts of M = Ti, Zr, and Hf for Pr in Pr/sub (1-x)/M/sub x/Co/sub 5/ were studied; a drop in moment and anisotropy but a surprising elevation in T/sup c/ were observed. While Ti, and to a lesser extent Hf, could partially replace Co in Pr/sub 2/Co/sub (17-x)/M/sub x/, it was found the Zr can only enter the crystal structure by substituting for Pr, as in Pr/sub (2-x)/Zr/sub x/Co/sub 17/. In the Ti- and Hf-doped alloys, spin-reorientation effects were observed, but they were not apparent in the Zr-doped alloys. In the Cu-containing alloys with the formula Pr/sub 2/ (Co/sub 16/Cu)/sub (17-x)/17M/sub x/, it was found that Ti, Hf, and Zr could be introduced up to x = 1.0. Substitution by Zr showed the greatest effects upon spin reorientation temperature and anisotropy. Fundamental magnetic properties of the R/sub 2/Fe/sub 14/B compounds with R = Y, Ce, Pr, Nd, Sm, Gd, Dy, Ho, Er, Yb and Th were studied

• Research Organization: Pittsburgh Univ., PA (USA)
• OSTI ID: 5312914
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
ANISOTROPY
BORIDES
BORON COMPOUNDS
COBALT ALLOYS
CRITICAL TEMPERATURE
IRON BORIDES
IRON COMPOUNDS
LOW TEMPERATURE
MAGNETIC PROPERTIES
MAGNETS
MATERIAL SUBSTITUTION
ORIENTATION
PERMANENT MAGNETS
PHYSICAL PROPERTIES
PRASEODYMIUM ALLOYS
RARE EARTH ADDITIONS
RARE EARTH ALLOYS
SPIN ORIENTATION
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE